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6CaCrO4 + 12Na2HPO4 💧→ 2Ca3(PO4)2↓ + 3H2Cr2O7 + 8Na3PO4 + 3H2O

The reaction of calcium chromate and sodium hydrogenphosphate yields calcium phosphate, dichromic acid, sodium phosphate, and water (Other reactions are here). This reaction is an acid-base reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
CaCrO4Calcium chromate6
Lewis acid
Soluble in water
Na2HPO4Sodium hydrogenphosphate12
Lewis base
Soluble in water

Products

Chemical formulaNameCoefficientTypeType in general
equation
Ca3(PO4)2Calcium phosphate2
Lewis conjugate
Very slightly soluble in water
H2Cr2O7Dichromic acid3
Non-redox product
Na3PO4Sodium phosphate8
Non-redox product
H2OWater3
Non-redox product

Thermodynamic changes

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
CaCrO4 (aq)-1426.3[1]
Na2HPO4 (cr)-1748.1[1]-1608.2[1]150.50[1]135.31[1]
Na2HPO4 (ai)-1772.38[1]-1612.98[1]84.5[1]
Na2HPO4 (cr)
2 hydrate
-2346.0[1]-2088.5[1]221.3[1]
Na2HPO4 (cr)
7 hydrate
-3821.7[1]-3279.8[1]434.59[1]
Na2HPO4 (cr)
12 hydrate
-5297.8[1]-4467.8[1]633.83[1]
* (aq):Aqueous solution, (cr):Crystalline solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
Ca3(PO4)2 (cr)
β, low temp. form
-4120.8[1]-3884.7[1]236.0[1]227.82[1]
Ca3(PO4)2 (cr)
α, high temp. form
-4109.9[1]-3875.5[1]240.91[1]231.58[1]
Ca3(PO4)2 (ai)-4183.2[1]-3698.1[1]-599.9[1]
H2Cr2O7
Na3PO4 (cr)-1917.40[1]-1788.80[1]173.80[1]153.47[1]
Na3PO4 (ai)-1997.9[1]-1804.5[1]-43.3[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (cr):Crystalline solid, (ai):Ionized aqueous solution, (l):Liquid, (g):Gas

References

List of references

  1. 1
    Janiel J. Reed (1989)
    The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units
    National Institute of Standards and Technology (NIST)